题目

The speaker raised his voice _____ make himself _____ by the listeners． A．so that; heard                              B．in order to; hearing C．so as to; heard                             D．to; to be heard 答案：C搜集各国的国旗标志，举出5个以上具有轴对称图形的标志，并画出它们所有的对称轴．